Wedding Gifts

I am attending my third wedding this spring and am searching for an affordable present. How much to spend on a couple I have only met a few times? I know them only because of my boyfriend so he and I are splitting the cost. I have heard the going rate is $200 on each wedding, as many friends seem to think that is the norm. I thought that these champagne flutes, which are $100, were special and could be engraved with their names. The flutes are at Things Remembered in Crossgates Mall in Albany, 456-4620.